138956 has 6 divisors (see below), whose sum is σ = 243180. Its totient is φ = 69476.

The previous prime is 138937. The next prime is 138959. The reversal of 138956 is 659831.

138956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (138959) by changing a digit.

138956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17366 + ... + 17373.

It is an arithmetic number, because the mean of its divisors is an integer number (40530).

2¹³⁸⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

138956 is a deficient number, since it is larger than the sum of its proper divisors (104224).

138956 is a wasteful number, since it uses less digits than its factorization.

138956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34743 (or 34741 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 138956 is about 372.7680243798. The cubic root of 138956 is about 51.7955482825.

The spelling of 138956 in words is "one hundred thirty-eight thousand, nine hundred fifty-six".